Muhamad, Yasmeen H. “A Simple Spectrophotometric Assay of Sildenafil In Pure and Pharmaceutical Preparations”. Al-Nahrain Journal of Science 15, no. 1 (September 2, 2018): 18–24. Accessed May 22, 2026. https://mail.anjs.edu.iq/index.php/anjs/article/view/1539.